NetworManager.swift

//
//  NetworManager.swift
//  GitHubApp
//
//  Created by GISELE TOLEDO on 10/04/23.
//

import Foundation

protocol NetworkManagerProtocol {
    func get<T: Decodable>(request: URLRequest, completion: @escaping (Result<T, Error>) -> Void)
}

final class NetworkManager: NetworkManagerProtocol {
    
    private let session: URLSession
    
    init(session: URLSession = .shared) {
        self.session = session
    }
    
    func get<T: Decodable>(request: URLRequest, completion: @escaping (Result<T, Error>) -> Void) {
        let task = session.dataTask(with: request) { data, response, error in
            if let error = error {
                completion(.failure(error))
                return
            }
            
            guard let data = data, let httpResponse = response as? HTTPURLResponse else {
                completion(.failure(NSError(domain: "Invalid response", code: 0, userInfo: nil)))
                return
            }
            
            guard (200...299).contains(httpResponse.statusCode) else {
                let statusCode = httpResponse.statusCode
                let localizedDescription = HTTPURLResponse.localizedString(forStatusCode: statusCode)
                completion(.failure(NSError(domain: "HTTP Error", code: statusCode, userInfo: [NSLocalizedDescriptionKey: localizedDescription])))
                return
            }
            
            do {
                let decodedData = try JSONDecoder().decode(T.self, from: data)
                completion(.success(decodedData))
            } catch {
                completion(.failure(error))
            }
        }
        
        task.resume()
    }
}